//验证是否为银行卡号
export default (bankno) => {
	const lastNum = +bankno.substr(bankno.length - 1, 1);
	const first15Num = bankno.substr(0, bankno.length - 1);
	const newArr = [];
	for (let i = first15Num.length - 1; i > -1; i -= 1) {
		newArr.push(first15Num.substr(i, 1));
	}
	const arrJiShu = [];
	const arrJiShu2 = [];
	const arrOuShu = [];
	for (let j = 0; j < newArr.length; j += 1) {
		if ((j + 1) % 2 === 1) {
			if (parseInt(newArr[j], 10) * 2 < 9) {
				arrJiShu.push(parseInt(newArr[j], 10) * 2);
			} else {
				arrJiShu2.push(parseInt(newArr[j], 10) * 2);
			}
		} else {
			arrOuShu.push(newArr[j]);
		}
	}

	const jishuChild1 = [];
	const jishuChild2 = [];
	for (let h = 0; h < arrJiShu2.length; h += 1) {
		jishuChild1.push(parseInt(arrJiShu2[h], 10) % 10);
		jishuChild2.push(parseInt(arrJiShu2[h], 10) / 10);
	}

	let sumJiShu = 0;
	let sumOuShu = 0;
	let sumJiShuChild1 = 0;
	let sumJiShuChild2 = 0;
	let sumTotal = 0;
	for (let m = 0; m < arrJiShu.length; m += 1) {
		sumJiShu += parseInt(arrJiShu[m], 10);
	}

	for (let n = 0; n < arrOuShu.length; n += 1) {
		sumOuShu += parseInt(arrOuShu[n], 10);
	}

	for (let p = 0; p < jishuChild1.length; p += 1) {
		sumJiShuChild1 += parseInt(jishuChild1[p], 10);
		sumJiShuChild2 += parseInt(jishuChild2[p], 10);
	}
	sumTotal = parseInt(sumJiShu, 10) + parseInt(sumOuShu, 10) +
		parseInt(sumJiShuChild1, 10) + parseInt(sumJiShuChild2, 10);
	const k = parseInt(sumTotal, 10) % 10 === 0 ? 10 : parseInt(sumTotal, 10) % 10;
	const luhn = 10 - k;
	if (lastNum === luhn) {
		return true;
	} else {
		return false;
	}
}
